VSS_FTR
__raw_writel(0x01, base + VSS_FTR);
__raw_writel(0x03, base + VSS_FTR);
__raw_writel(0x07, base + VSS_FTR);
__raw_writel(0x0f, base + VSS_FTR);
__raw_writel(0x1f, base + VSS_FTR); /* enable isolation cells */
__raw_writel(0x0f, base + VSS_FTR); /* disable isolation cells */
__raw_writel(0, base + VSS_FTR); /* disable all footers */